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Filename : stap_time.stp
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#!/usr/bin/stap 
# Copyright (C) 2018 Red Hat, Inc.
# Written by William Cohen <wcohen@redhat.com>
#
# Provide concise plottable information about phases 0-4 of systemtap

global start, pass0, pass1, pass2, pass3, pass4

function print_head() {printf("")}
function print_tail() {printf("")}

probe begin { print_head() }
probe end { print_tail() }

probe stap.pass0 { start[session] = gettimeofday_ms() }
probe stap.pass0.end { pass0[session] = gettimeofday_ms() }
probe stap.pass1.end { pass1[session] = gettimeofday_ms() }
probe stap.pass2.end { pass2[session] = gettimeofday_ms() }
probe stap.pass3.end { pass3[session] = gettimeofday_ms() }

probe stap.pass4.end {
  pass4[session] = gettimeofday_ms()
  // Dig through C++ string private fields to find the systemtap script name
  cmdline_script = @cast(session, "struct systemtap_session")->cmdline_script->_M_string_length
  if (cmdline_script) {
    script = "<cmdline_script>"
  } else {
    len = @cast(session, "struct systemtap_session")->script_file->_M_string_length
    if (len <= 15) {
      script_file = @cast(session, "struct systemtap_session")->script_file->_M_local_buf
    } else {
      script_file = @cast(session, "struct systemtap_session")->script_file->_M_dataplus->_M_p
    }
    script = user_string2(script_file, "<unavailable>")
  }
  // print out data
  printf("%s %d %d %d %d %d\n",
         script,
	 pass0[session] - start[session],
	 pass1[session] - pass0[session],
	 pass2[session] - pass1[session],
	 pass3[session] - pass2[session],
	 pass4[session] - pass3[session])
  // delete entries
  delete pass0[session]
  delete pass1[session]
  delete pass2[session]
  delete pass3[session]
  delete pass4[session]
}